[paul.fr]

 []

[elegantlywasted]

The grass in some parts of Kentucky & Tennessee actually has a bluish tone. Its not a very soft grass however.

[DoctorBeaver]

Isn't wheat a grass? Some reeds are yellow also.

[elegantlywasted]

Technically yah.. i think... And there are alot of ornamental grasses that have red stripes or blue ones, I have even seen pink plumes on a variety before

[Alandriel]

Yep! Lots of grasses are not green  []

From Wikipedia (because they say it so much better than I could)
Grass is a common word that generally describes a monocotyledonous green plant in the family Gramineae (Poaceae). True grasses include most plants grown as grains, for pasture, and for lawns (turf). They include some more specialised crops such as lemongrass, as well as many ornamental plants, and some weeds. They also include plants often not considered to be grasses, such as bamboos.

Kentucky Bluegrass is famous btw  [] and often used in low to medium traffic areas, often incorporated with other grass species to produce a better multi-purpose lawn.

Wikipedia on ornamental grasses